Thorax Extra

Question 1

Narrowest part of alimentary tract?

Answer 1

• Vermiform appendix and

- Esophagus

Question 2

Types of muscles in esophagus?

Answer 2

Upper 1/3rd striated muscle
Middle 1/3rd - Striated and smooth muscle
Lower 1/3rd - Smooth muscle

Question 3

Esophagus passes through which part of diaphragm?

Answer 3

Right crus of diaphragm at T10 level

Question 4

Blood supply of esophagus?

Answer 4

1. Cervical part - Inferior thyroid artery
2. Thoracic part - Esophageal branch of Desc. thoracic aorta
3. Abdominal part - Esophageal branch of left gastric artery

Question 5

Venous drainage of esophagus?

Answer 5

1. Upper part - Brachiocephalic veins
2. Middle part - Azygous vein
3. Lower part - Left gastric vein

Question 6

Intercostal nerves are formed by?

Answer 6

Anterior rami of spinal nerves T1 to T11.

Question 7

Which is the Subcostal nerve?

Answer 7

Anterior ramus of spinal nerve T12.

Question 8

Upper 2 intercostal nerves supply?

Answer 8

Upper limbs and intercostal space

Question 9

Typical intercostal nerves supply?

Answer 9

Only thoracic wall. (3rd to 6th intercostal nerves)

Question 10

Lower 5 intercostal nerves supply?

Answer 10

Abdominal wall and intercostal spaces.

Question 11

Largest branch of intercostal nerve is?

Answer 11

Lateral cutaneous branch

Question 12

Lateral cutaneous branch of 2nd intercostal nerve is?

Answer 12

Intercostobrachial nerve

Question 13

Muscles supplied by intercostal nerves?

Answer 13

1. Intercostal muscles
2. Serratus posterior superior
3. Transversus thoracis

Question 14

What is Notalgia paraesthetica?

Answer 14

Abnormal sensation in area between medial edge of scapula and spine due to entrapment of dorsal cutaneous branch of an intercostal nerve as it passes through erector spinae.

Question 15

Anterior intercostal arteries are derived from?

Answer 15

• 1-6 pairs are from lateral branches of internal thoracic arteries
• 7-9 pairs are from musculophrenic artery

Question 16

Posterior intercostal arteries are derived from?

Answer 16

• Totally 11 pairs;
• 1st & 2nd pair - from Superior intercostal artery
• Remaining 9 pairs - from posterior surface of thoracic aorta

Question 17

Principal artery of upper limb is?

Answer 17

Subclavian artery

Question 18

Which muscle divides subclavian artery?

Answer 18

Scalenus anterior divides it into:

Medial, posterior and Lateral parts.

Question 19

Branches of first part of subclavian artery?

Answer 19

1. Vertebral artery
2. Internal thoracic artery
3. Thyrocervical trunk:
   
   • Suprascapular artery
   • Transverse cervial artery
   • Inferior thyroid artery

Question 20

Branches of second part of subclavian artery?

Answer 20

• Costocervical trunk
  
  • Superior intercostal artery
  • Deep cervical artery

Question 21

Branches of third part of subclavian artery?

Answer 21

Dorsal scapular artery.